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Class 10 Class 12
Mention the significance and disdvantages of hydroponics.

Significance of hydroponics :

1. Through hydroponic gardening; plants can be grown anywhere as long as their growth  requirements are met .

2. Plants produced are free from soil pathogens and diseases as no soil is involved.

3. Plants grown are free from harmful chemicals as fertilizers and pesticides are not used.

4. The plants can be produced at those places where there is scarcity of land and the soil is thin or infertile.

5. The plants grown by this method are more healthy.

1. The initial set-up is very costly.

2. It needs the help of expert scientists to prepare the required nutrient medium and its maintenance.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

What is Hidden hunger in the case of plants?

Hidden hunger refers to a situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms. The nutrient content is above the deficiency symptom zone but still considerably needed for optimum crop production

How is nitrogenase enzyme protected ?

The nitrogenase enzyme is very sensitive to the molecular oxygen. It requires anaerobic conditions to work. The leg-haemoglobin in the nodule acts as an oxygen scavenger just meainting the anaerobic condition needed by the enzyme.

What type of condition is created by leghaemoglobin in the root modules of legumes ?

Anaerobic.

Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.

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